ArrayList for XML help

Hi,

I've got no errors for compiling but I can't figure out why there isn't any stored output when I save them into a XML file.

thanks!

Current output

Code:

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<?xml version="1.0" encoding="utf-8" ?>
  <AirlineArray xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xsi:nil="true" />

---

Wanted output

Code:

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<?xml version="1.0" encoding="utf-8"?>
<AirlineArray xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <airlineList>
    <RFQSave>
      <quotationId>1234</quotationId>
      <supplier>1301</supplier>
      <prodName>Singapore Airline</prodName>
      <classType>Economy Class</classType>
      <adultQuantity>4</adultQuantity>
      <childQuantity>4</childQuantity>
    </RFQSave>
  </airlineList>
</AirlineArray>

---

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Array to store RFQSave

Code:

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public class AirlineArray
{
    public RFQSave[] airlineList;
}

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RFQSave

Code:

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public class RFQSave
{   
        public string quotationId;   
    public string supplier;   
    public string prodName;   
    public string classType;   
    public string adultQuantity;   
    public string childQuantity;   

    public RFQSave(string nid, string nsupplier, string nprodName, string nclassType,
        string nadultAmt, string nchildAmt)
    {
        quotationId = nid;
        supplier = nsupplier;
        prodName = nprodName;
        classType = nclassType;
        adultQuantity = nadultAmt;
        childQuantity = nchildAmt;
     
    }

    public RFQSave() { }
       
}

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Main code

Code:

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public partial class _Default : System.Web.UI.Page
{
    private int counter;
    private AirlineArray airline;
    private RFQSave airSave;

    protected void Page_Load(object sender, EventArgs e)
    {
        airline = new AirlineArray();
        counter = 0;       
    }

    protected void btnStore_Click(object sender, EventArgs e)
    {     

        if (ddlAirline.SelectedValue == "1301")
        {
            tbxName.Text = "Singapore Airline";
            lblWarning.Text = "";                 

            airSave = new RFQSave(tbxQuotationID.Text, ddlAirline.Text, tbxName.Text, ddlClass.Text, tbxdoulePrice.Text, tbxSingleQuantity.Text);

            //add airSave to the Airline RFQ
            RFQSave[] temp = new RFQSave[counter + 1];
            for (int i = 0; i < counter; i++)
            {
                temp[i] = airline.airlineList[i];
            }
            temp[counter] = airSave;
            counter++;
            airline.airlineList = temp;                       

            lblWarning.Text = "Sinagpore Airline Quotation Stored, ready for export!";
        }       

    }
       
    protected void btnSave_Click(object sender, EventArgs e)
    {       
        XmlWriterSettings settings = new XmlWriterSettings();
        settings.Indent = true;
        XmlWriter wrt = XmlWriter.Create("D://AirlineRFQ.xml", settings);
        XmlSerializer serializer = new XmlSerializer(typeof(AirlineArray));
        serializer.Serialize(wrt, airline);
        wrt.Close();

        lblWarning.Text = "Airline Quotation XML exported!"; 
   
    }       
    }

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